Col de L'Iseran  (Bonneval-sur-Arc) Bike Climb - PJAMM Cycling

Col de L'Iseran (Bonneval-sur-Arc)


Col de L'iseran via Bonneval-sur-Arc Cycling Guide: Stunning Views from Atop Europe

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Climb Summary

Climbing Col de L’Iseran from Bonneval-sur-Arc by bike; narrow road and cliff

Col de L'Iseran - one of the most spectacular cycling climbs in the world.

Photo by PJAMM contributor Ard Oostra, Switzerland.

Cycling Col de l’Iseran - cyclist on bike, road, mountains, sky

Col de L'Iseran, located in the French Alps, is a magnificent cycling climb.

This is the highest paved pass in Europe and has been included seven  times in the Tour de France as of 2019.

Cycling Col de l’Iseran - cyclist on bike, road, mountains, sky

Softer, yet equally gorgeous scenery on the southern approach.

Col de L'Iseran is part of the Route des Grandes Alpes, a tourist itinerary that begins in Thonon-les-Bains and travels over many of the most spectacular passes in France and Europe, including Col de L'Iseran, Galibier, d’Izoard, and Bonette; alternate route includes Croix de Fer and Madeleine.

Col de L'Iseran is #30 in Hugh Merrick’s book The Great Motor Highways of the Alps, in which he writes that “the impression that emerges, rather like the stunning vistas of the Chalanson and Albaron glaciers as one nears the summit from the southern side, is of a feat of road building that was also in part a vanity project.”

Aerial view of Col de L'Iseran

Photo: Carreteras Peligrosas

Is Col de L'Iseran truly the highest paved pass in Europe?

Yes.  While Pico de Veleta, Spain, is the higher “road” at 3,357 m / 11,013’, it ends in a dead end so is not a pass.  Even though Cima de la Bonette (2,685 m / 3,809’) is technically a pass, it is just a through road to the peak and not the functional “pass.”  Thus, Col de L'Iseran, with its functional col/pass at 2,633 m / 8,638’ can truly claim “highest paved pass in Europe.”

Learn from our mistakes in ascending Col de L'Iseran.

These two climbs are great examples of why it is important to actually do the climb (or have credible data from those who have) before providing input on them to the public.  We misfired on each of these climbs, one to our disadvantage and one to our advantage

How to Cycle Col de L'Iseran from Bonneval-sur-Arc

(this col can and should be cycled from both sides)

Misfire #1 (to our advantage) - Southern Approach: We started in Lanslebourg-Mont-Cenis, 18 kilometers below where the true climb begins in Bonneval-sur-Arc.  Unlike the extra miles on the north side that we do not recommend, the extra 18 kilometers tacked onto the true climb by starting in Lanslebourg is highly recommended because the views, surroundings and scenery over those 12 kilometers is simply exquisite.  The true and shorter climb is 13.4 km / 1,302 m ’ / 7.6% and this is where the kilometer markers for the climb begin.

Col de L’Iseran from Bonneval-sur-Arc by bike - road sign at start

Start of climb at Bonneval-Sur-Arc.

Cycling Col de L’Iseran from Bonneval-sur-Arc - meadow, farm houses, cut of road in mountain

Roadway is seen middle-left of picture.

Bike climb of Col de L’Iseran from Bonneval-sur-Arc narrow road with sheer cliff

Narrow road and sheer cliff to the left around 3 kilometers from the Col.

Climbing by bike Col de L’Iseran from Bonneval-sur-Arc, final km marker, km marker 1

KM markers lead us up the mountain -- above is last marker.

One of highest climbs in Europe, Col de L’Iseran from Bonneval-sur-Arc - summit

Left:  Chapel Notre-Dame de Toute Prudence.

Right:  Store.

Bicycling Col de L’Iseran from Bonneval-sur-Arc John Johnson PJAMM cycling with bike at col sign

Cycling Col de l’Iseran - cyclist on bike, road, mountains, sky

Stark yet magnificent views on the north.

Was Col de L'Iseran included in the Tour de France?

Col de L'Iseran first appeared in the TdF in 1938 and as of 2020 had been included a total of eight times in the great race.  Wikipedia provides a nice table of Tour appearances for this climb:






Leader at the summit






 Yaroslav Popovych (UKR)






 Claudio Chiappucci (ITA)






 Fernando Manzaneque (ESP)




Le Lautaret


 Adolf Christian (AUT)






 Giuseppe Tacca (FRA)






 Sylvère Maes (BEL)





 Félicien Vervaecke (BEL)

Tour de France History

Col de L'Iseran has only been included in the Tour de France seven times in the 80 years between 1938 and 2018.  The TdF takes what is otherwise a somewhat eerie and desolate -- although quite scenic -- place, and turns it into a tourist attraction with a carnival atmosphere.  First included in the Tour in 1938, Gino Bartali exclaimed that he won the race on his descent of Col de Vars, but saved it on the descent off the L'Iseran.  

Gino Bartali, winner 1938 Tour de France

Bartali crossed L'Iseran in Stage 14

Down 00:01:05 at the beginning of the stage, after a heroic descent of L'Iseran he finished up 00:05:18.


Bartali (along with Federico Bahamontes) has more Grand Tour wins (9) than anyone in history and the TdF (1938, 1948), Giro (1936, 1937, 1946; mountain classification a record seven times, three more than anyone in history, Giro wasn’t held five years from 1941-1945), Milan-San Remo (4) and Giro di Lombardia (3).

It was on Col de L'Iseran that legendary cyclist Louison Bobet’s career ended.  Bobet retired at the summit of L'Iseran on July 14, 1959, having been victorious in the TdF three years running from 1953-55. Bobet was the first rider to win the Tour de France in three consecutive years.

Louison Bobet on Col de L'Iseran 1959 Tour de France

Bobet retired on L'Iseran July 14, 1959 after three TdF victories.

Photo:  Walter Vermeulen flicker

July 9, 1963 is notable more for the brutal conditions on the L'Iseran than for the race stage itself (won by undisputed King of the Mountains Fernando Manzaneque -- winner mountain classification TdF six times, Giro d’Italia once, and Vuelta de Espana twice).  Due to impassable snow pack at the top of Col de L'Iseran, the tour came within a whisker of a tedious and long reroute around Albertville and Bourg Saint Maurice of the 202 km stage from Grenoble to the scheduled finish in Val d'Isère.  However, the tour organisers, having more consideration for their business and schedule than the riders’ safety, maintained the original route which led the tour over the high pass along icy roads and a snow tunnel.

Col de L'Iseran -- Stage 16, Tour de France July 9, 1963.


Near the summit of L'Iseran TdF 1963


Likely the most famous of the eight crossings of the L'Iseran during the Tour de France involved the amazing solo 100 kilometer breakaway by Italy’s Claudio Chiapucci, a true Mountain King.  Chiapucci has legendary mountain classification credentials -- one of only four men to win the TdF and Giro mountain classification in the same year (putting him in the enviable company of Fausto Coppi, Charly Gaul and Lucien Van Impe), and tied with Gino Bartali with the most Giro mountain classification wins (7).  With 100 kilometers to go on July 18, 1992’s TdF Stage 13, Chiapucci did one of his signature (though sometimes ill-advised) breakaways.  However, on this day the peloton mistakenly ignored Chiapucci who burned over seven cols, including the highest of them all, L'Iseran, on his way to a 00:01:34 stage win.  Chiapuccu was second in that year’s Tour to Miguel Induran who won his second of an unbelievable five straight Tours de France.

Claudio Chiapucci (KOM jersey) and Miguel Indurain (leader’s jersey).  Indurain is the 1991 & 1992 TdF

mountain classification winner.